OB/Gyn Physicians

Our OB/Gyn physicians are skilled and competent professionals. They exude warmth and compassionate care for every single patient. These physicians truly love their work, and they care deeply about you and your baby.maternity doctors

In your physician, you’ll find a friend, an advocate and a partner in care who will walk alongside you every step of the way, as you prepare to deliver your baby then on the big day when your little one makes his or her appearance.

Catherine Kim, MDCatherine Kim, MD
OB/Gyn

(805) 527-8055
Simi Obstetrics and Gynecology
1147 Red Tail Way
Simi Valley, CA 93065

Dr. Kim, a founding member of Simi Obstetrics and Gynecology, has been in practice in Simi Valley since 1998 and has delivered more than 2,500 babies. She is passionate about women’s healthcare and views it as a privilege to care for her patients through the different phases of their lives.

She completed her residency in obstetrics and gynecology at the Harbor-UCLA Medical Center where she received the Excellence in Laparoscopic Procedure honor as the chief resident. Dr. Kim earned her medical degree from UCLA School of Medicine after completing her undergraduate degree in molecular biology at University of California, Berkeley.

A respected leader in the community, Dr. Kim has served as the chief of the perinatal department at Adventist Health Simi Valley and received the Adventist Health Simi Valley Hospital Physician of the Year Mission Award in 2013. In addition, Dr. Kim has been the volunteer medical director at the Simi Valley Community Pregnancy Clinic.

Dr. Kim is board certified by the American Board of Obstetrics and Gynecology, is a Fellow of the American College of Obstetrics and Gynecology and is a member of the California Medical Association.

Dr. Kim enjoys music and spending time with her husband and three sons.


Irene Tan, MDIrene Tan, MD
OB/Gyn

(805) 527-8055
Simi Obstetrics and Gynecology
1147 Red Tail Way
Simi Valley, CA 93065

Dr. Tan has been in private practice in Simi Valley since 2008 and has served as vice chief of Adventist Health Simi Valley’s perinatal department. As part of her dedication to excellent patient care, Dr. Tan is committed to staying in the forefront of medical technology.

Dr. Tan is board certified by the American Board of Obstetrics and Gynecology and is a Fellow of the American College of Obstetrics and Gynecology. She completed her residency in obstetrics and gynecology at the University of Buffalo. Dr. Tan earned her medical degree from Ross University School of Medicine after completing her undergraduate degree in biology at Whittier College.

Dr. Tan is chief of the perinatal department at Adventist Health Simi Valley and has been published in various medical journals, including the American Society of Clinical Oncology’s journal, the Journal of Parasitology and the Journal of Herpetology.

She enjoys traveling and cooking in her spare time.


Ga Yi (Grace) Lee, MDGa Yi (Grace) Lee, MD
OB/Gyn

(805) 527-8055
Simi Obstetrics and Gynecology
1147 Red Tail Way
Simi Valley, CA 93065

Dr. Lee is known for her warm, comforting personality and her excellent clinical knowledge. She is committed to providing a caring atmosphere that addresses each patient’s personal needs and concerns.

Dr. Lee received honors and awards in recognition of her academic and professional excellence during her residency, including the CREOG Exam Achievement Award and Resident Research Award. She has also presented her IUD research at a national conference.

Dr. Lee is a member of the American Medical Association and a Junior Fellow of the American College of Obstetrics and Gynecology. She completed her residency in obstetrics and gynecology at Drexel University College of Medicine in Philadelphia. Dr. Lee earned her medical degree from Albany Medical College after completing her undergraduate degree in molecular cell biology at the University of California, Berkeley.

Dr. Lee enjoys watching movies and reading.


Sarah Garcia, DOSarah Garcia, DO
OB/Gyn

(805)527-8055
Simi Obstetrics and Gynecology
1147 Red Tail Way
Simi Valley, CA 93065

Dr. Garcia is dedicated to providing evidence-based medicine tailored to her patients’ needs in a welcoming and caring environment. She always ensures that all of her patients’ questions have been answered and they understand their treatment options and plan.

She is board certified and recently received the Top Doc Award at Adventist Health Simi Valley. She is a member of the American College of Osteopathic Obstetricians and Gynecologists, American Congress of Obstetricians and Gynecologists and American Osteopathic Association.

She completed her residency in obstetrics and gynecology at Arrowhead Regional Medical Center and Riverside County Regional Medical Center associated with Western University College of Osteopathic Medicine in Pomona, California, where she delivered more than 1,000 babies.

She served as a board member of the Resident Advisory Committee and presented her research in gestational diabetes at a national conference, where she won third place. Dr. Garcia earned her Osteopathic Medical Degree from Touro University Nevada College of Osteopathic Medicine after completing her undergraduate degree and graduating with honors in microbiology at Weber State University.

Dr. Garcia enjoys wakeboarding, spending time at the lake and scuba diving.


David Yamada, MDDavid Yamada, MD
Family Medicine

(805) 527-9140
AHPN Family Practice Simi Valley
2750 North Sycamore Drive, Suite 202
Simi Valley, CA 93065

Dr. David Yamada is board certified by the American Board of Family Practice. He obtained his undergraduate degree in microbiology from the University of California, Berkley.

After earning his medical degree from the University of Southern California School of Medicine, Dr. Yamada completed his residency in family practice at Northridge Hospital Medical Center. He currently serves as chief of the department of family medicine at Adventist Health Simi Valley.